Kissing in a dream is something natural that everyone growing up experiences. The act is a desire to feel love and wanted; at the same time a starting point to connect with someone physically. First base is the gateway to every position.
The individuals, you like and desire most, will appear in your dreams wanting to kiss you or openly accepting kisses from you. Every kiss is a renewal of youthful energy and sexual desires.
Seeing a significant other kiss another person in your dream indicates you have doubts in the relationship, or sensing their infidelity, or a rationalization behind your own cheating.